Carbon paper



Dee. 15,1931. c. J. DIENELT 1,836,907

- CARBON PAPER Filed Nov. 26, 1930 w v v \1 MW A TTORNE Y.

Patented Dec. 15, 1931 UNITED STATES CHARLES J. DIENELT, OF WASHINGTON, DISTRICT OF COLUMBIA CARBON PAPER Application filed November 26, 1930. Serial No. 498,487.

This invention relates to improvements in carbon paper sheets, and more particularly to the forming of a plurality of crimps along the opposite edges of a sheet, whereby the same will not curl up when placed upon a table or the like, and exposed to the atmosphere. 7

An object of the invention is to provide an improved form of carbon paper which will 10 lay flat without rolling up or curling when placed upon an object with the carbon surface uppermost.

Another object of the invention is to provide a sheet or sheets of carbon paper with a plurality of crimps formed along the opposite sides thereof in such a manner that the upper surfaces of the crimped portions will be the carbon coated side of the paper.

A further object of the invention is to provide a sheet or sheets of carbon paper with a plurality of inwardly extending crimps formed at intervals along the edges of the paper, whereby the paper will not roll or curl up when placed at upon a table or the like, and will not creep or fold under when placed between sheets of paper in a typewriting machine.

A still further object of the invention is to provide a nonrolling or curling sheet of carbon paper.

Another object of the invention is to provide an improved form of carbon paper in which crimps are formed along the opposite edges of the sheet without injuring the efliciency of the manifolding or copying qualities of the paper, wherebythe tendency of the paper to roll or curl will be positively overcome.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of my application,

Figure 1 is a plan view of my improved form of carbon paper;

Figure 2 is a detail partial perspective view of my invention, and

Figure 3 is anedge view of a sheet of carbon paper formed in accordance with my invention.

Like characters of reference are used throughout the following specification and the accompanying drawings to designate corresponding parts.

- In carrying out my invention, I provide a sheet of carbon paper 1 of any desired size, and in any suitable or desired manner form a plurality of inwardly directed crimps 2 along the opposite edges of the same. I have illustrated a crimp adjacent each end of the sheet and at the opposite sides thereof, and the remainingcrimps are formed so that instead of the crimps on the opposite sides of the sheet being opposite each other, they are staggered, although I have in mind to use any arrangement or form of crimping.

I have found that unless a room is quite warm, carbonpaperwill either roll up from one side into a tight roll, or will roll simultaneously' from the opposite sides into two tight rolls, and it is particularly to overcome this condition that I have devised the idea of crimping the opposite edges of the sheet. As before mentioned, the crimps will be made when the carbon paper is placed with the car-' bon surface upright, and the upper ridges and sloping sides of the crimps will be carbon covered, as distinguished from the plain paper backing.

,It will be apparent that the crimps may be made at any angle to the sides of the paper, or the crimps may assume any form desired, the primary idea being to reinforce the side edges of the paper by crimping so as to overcome any tendency it may have to curl or roll up. As before mentioned, the crimps placed along the sides of the paper will prevent it from creeping when placed between sheets of paper, and will overcome the bending over of a corner of the carbon paper as is often the case, thereby making it necessary to rewrite a whole page because the copy was not made on a small corner of one of the under sheets of paper.

While I have illustrated the crimps as ex- 95 tending only a portion of the distance across the sheet of carbon paper, it will be understood that I do not intend to limit myself to the exact distance that the crimps extend, as they may be longer or shorter than'illustrated, or if desired may extend the full distance across the sheet.

It has been found that much valuable time may be saved by using carbon paper formed in the manner of my invention, as no time is lost in placing the sheets of carbon paper between the typewriting paper, and the carbon paper does not permit the typewriting paper to creep, thereby making it unnecessary to rewrite one or more pages of the work due to uneven spacing of the lines of typing.

Minor changes in construction may be resorted to without departure from the spirit of the invention.

Having thus described my invention What I claim as new and desire to secure by Let: ters Patent of the United States is 1. A sheet of carbon paper having reinforcing crimps formed along the marginal edges thereof whereby the sheet is rendered non-curlable.

2. A sheet of carbon paper having reinforcing criinps formed along the marginal edges thereof, the upper surfaces of said criinps being the carbon coated side of the sheet.

3. A sheet of carbon paper having a'plurality of inwardly directed crimps along the opposite sides of the sheet, said crimps being disposed directly opposed to the crimps on the opposite side of the sheet.

4. A sheet of carbon paper having a plurality of inwardly directed crimps disposed in staggered relation along the oppositemarginal edges of the sheet.

In testimony whereof I aifix my signature.

CHARLES J. DIENELT. 

